What alternate name for the summer solstice comes from a Latin-based word meaning summer?

The alternate name for the summer solstice that comes from a Latin-based word meaning summer is the estival solstice.

“Estival” comes from Latin aestivus, meaning “of summer,” and is related to the Latin word aestas, or “summer.” The term is a formal, less common counterpart to “summer solstice,” much like hibernal solstice means winter solstice.

A solstice occurs when the Sun reaches its greatest apparent distance north or south of the celestial equator. At the estival solstice, one hemisphere is tilted maximally toward the Sun, producing its longest daylight period. The June solstice is estival in the Northern Hemisphere but hibernal in the Southern Hemisphere.

A common mix-up is treating “summer solstice” as a globally fixed event. The same solstice is summer for one hemisphere and winter for the other; “June solstice” and “December solstice” are more geographically neutral names.